地理上的隔离是隔离种群所必需的条件，且地理隔离的性质完全取决于生物体的生物学特性及其分散的可能性。

The nature of the geographic separation necessary to isolate populations depends entirely on the biology of the organism and its potential for dispersal.

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谷氨酰胺是一种条件性必需氨基酸，因其特有的生物学功能，近年逐渐受到动物营养学家的广泛关注。

Glutamine is a conditional essential amino acid. Recently, glutamine has been paid attention by animal nutritionist, because of its special biological functions.

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功能性氨基酸是指除了合成蛋白质外还具有其他特殊功能的氨基酸，其不仅对动物的正常生长及维持是必需的，而且对多种生物活性物质的合成也是必需的。

They are called functional amino acids which are necessary not only to animal growth and maintenance requirement, but also to the synthesis of bioactive molecules.

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